I have very little experience with electricity, but I am doing a project in which I need to measure power output of solar cells.
I am currently using this:
http://www.pasco.com/prodCatalog/PS/PS-2115_pasport-voltage-current-sensor/index.cfm with GLX software to measure voltage/current over time/temperature. When I measure either voltage or current, the values are correct – as checked by a multimeter.
However, when I try to measure both simultaneously – which I must do – the values seem to equalize at around 0.5 for each – incorrect for both values.
I know I can just use a multimeter and record that way, but I need to be able to do this hands free and simultaneously.
Is there a circuit or something I can use or setup that will help me measure both accurately and simultaneously?
Kinda embarrassed to post this, but i guess I'll never learn otherwise.
simulate this circuit – Schematic created using CircuitLab
The battery is supposed to represent the PV cell. The voltmeter/ammeter next to each other are supposed to represent the probe with its dual function. Can you suggest any other way to set it up and/or is there major problems with what I am doing (probably numerous).
Best Answer
Theoretically, you have an appropriate schematic. I'd place the voltmeter across the terminals for the solar panel itself, since resistance in the wires can contribute to power loss, with large enough currents.
The ammeter is then placed in-line, either high-side, or low-side depending on your preference. Personally, I'd prefer low-side.